Question 1

What is the correct reading of the liquid volume in the graduated cylinder shown in the image, considering proper significant figures and reading at the bottom of the meniscus?

Accepted Answer

$$4.75\ \mathrm{mL}$$

Question 2

Which of the following is an intensive property?

Accepted Answer

Density

Question 3

Given the periodic table section shown, which group contains only nonmetals?

Accepted Answer

The group on the far right (purple)

Question 4

Which of the following ions is polyatomic and carries a $$2-$$ charge?

Accepted Answer

Sulfate, $$\mathrm{SO}_4$$^{2-}$$

Question 5

A sample of diamond has a mass of $$20.4\ \mathrm{g}$$ and a density of $$3.51\ \mathrm{g/mL}. $$What is its volume?

Accepted Answer

$$5.81\ \mathrm{mL}$$

Question 6

Which law states that a chemical compound always contains the same proportion of elements by mass?

Accepted Answer

Law of Definite Proportions

Question 7

If a compound contains $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass, what is its empirical formula?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 8

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 9

Calculate the average atomic mass of chlorine given $$75.77\%$$ $$^{35}\mathrm{Cl} ($$mass $$34.97\ \mathrm{u}) $$and $$24.23\%$$ $$^{37}\mathrm{Cl} ($$mass $$36.97\ \mathrm{u}).$$

Accepted Answer

$$35.45\ \mathrm{u}$$

Question 10

Which of the following is the correct formula for ammonium acetate?

Accepted Answer

$$\mathrm{NH}_4\mathrm{C}_2\mathrm{H}_3\mathrm{O}_2$$

Question 11

A student adds $$21.567\ \mathrm{g}$$ and $$42.3\ \mathrm{g}$$ and reports the answer as $$63.867\ \mathrm{g}. $$What is the correct answer with proper significant figures?

Accepted Answer

$$63.9\ \mathrm{g}$$

Question 12

Which of the following is a correct statement about exact numbers?

Accepted Answer

Exact numbers have an infinite number of significant figures.

Question 13

Which of the following best describes the difference between empirical and molecular formulas?

Accepted Answer

Empirical formulas show the simplest ratio of elements, while molecular formulas show the actual number of atoms.

Question 14

Which of the following is the correct name for $$\mathrm{Na}_2\mathrm{SO}_4 \cdot 10\mathrm{H}_2\mathrm{O}$$?

Accepted Answer

Sodium sulfate decahydrate

Question 15

Which of the following is the correct formula for phosphate ion?

Accepted Answer

$$\mathrm{PO}_4$$^{3-}$$

Question 16

A compound contains $$2.00\ \mathrm{mol} of $$nitrogen and $$5.00\ \mathrm{mol} of $$oxygen. What is its empirical formula?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_5$$

Question 17

Which of the following is a correct conversion factor for converting centimeters to inches?

Accepted Answer

$$\displaystyle \frac{1\ \mathrm{in}}{2.54\ \mathrm{cm}}$$

Question 18

Which of the following is the correct name for $$\mathrm{CO}_2$$?

Accepted Answer

Carbon dioxide

Question 19

Which of the following best describes the role of electrons in determining the size of an atom?

Accepted Answer

Electrons repel each other, causing the atom to expand in size.

Introduction to Chemistry: Essential Concepts and Study Guide

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